Business Segment Information - Information by Geographical Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue and property, plant and equipment by geographical area
Total revenue	$ 478.2	$ 396.1	$ 396.0	$ 353.5	$ 508.0	$ 419.8	$ 457.4	$ 423.7	$ 1,623.8	$ 1,808.9	$ 1,839.4
Total property, plant and equipment, net	231.1				249.9				231.1	249.9
United States
Revenue and property, plant and equipment by geographical area
Total revenue									380.4	387.6	359.7
Total property, plant and equipment, net	43.2				45.9				43.2	45.9
Germany
Revenue and property, plant and equipment by geographical area
Total revenue									198.9	215.1	188.9
Total property, plant and equipment, net	125.9				143.8				125.9	143.8
Rest of Europe
Revenue and property, plant and equipment by geographical area
Total revenue									479.6	522.9	583.7
Total property, plant and equipment, net	54.7				53.6				54.7	53.6
Asia Pacific
Revenue and property, plant and equipment by geographical area
Total revenue									414.9	495.5	529.1
Total property, plant and equipment, net	4.2				4.7				4.2	4.7
Other
Revenue and property, plant and equipment by geographical area
Total revenue									150.0	187.8	$ 178.0
Total property, plant and equipment, net	$ 3.1				$ 1.9				$ 3.1	$ 1.9